Asphalt expansion joint



Patented Apr. 7, 1931 1. NITED STATES PATENT oFFicl:

ALBERT C. FISCHER, F CHICAGO, ILLINOIS, ASSIGNOR TO THE PHILIP CAREYMANU- FACTURING COMIPANY, A CORPORATION OF OHIO y ASPHALT EXPANSION OINTApplication mea :my 2s, 1922. serial No. stair?.l

This invention relates to an improvement in asphaltic expansion jointsfor concrete pavements. Heretofore it has been customary to use dustingmaterial upon the sides of 5 asphalt expansion joints to prevent thesides sticking to one -another in packing. Later it was foundadvantageous to coat one of the sides with a layer of saturated feltsqueezed dry. This was followed by coating the sides with open meshedburlap, and was later followed by using felt sides on both sides of theasphalt materials, the purpose being to make the joint easier to handleon the part ofthe contractor.

Tale, bone dust and other'substances used as dusting materials soonbecome penetrated by the asphaltic material, and, therefore, do not bindwith the concrete in the roadwhen poured against the sides. Likewise thesaturated felt by reason of its aterproof nature does not permitofadhesion to the concrete sides when the moist batch of concrete ispoured up against it, and consequently there is no true adhesion.

In the accompanying drawings :-l

Fig. 1 is a section of expansion joint strip embodying my invention; and

Fi 2 is a section of pavin in which the nove expansion joint strip isinserted.

dusting materials and apply them on the sides of the asphaltic body insuch a manner that they not only prevent the joints from adherin' toeach other in the crates, but by using -aind-in means the dustingparticles are united as w en dusted upon the asphaltic body, and are,constituted of4 materials which 'readily unite with the concrete mass,so that when the concrete batch is poured up against 40 the sides' ofthe expansion joint it becomes one cohesive whole, and the particles onthe side become a part of the concrete mass.

The proper method of accomplishin this result is by coating the sides ofthe 'as altic mass with a layer of adhesive material. It may beperformed in various ways. For instanceya layer of silicate of soda inthe nature of a very thin film 3 may be prepared and coated over the`sides of the asphaltic body 5o 2,01` other substances may be mixed,such as,

The purpose of this invention .is to furnishsilicate of soda and calciumchloride, which will furnish a waterproof substance as a binder.Likewise, avery high melting point asphalt may be ucsd as the bindingmeans, which cools quickly when heat is removed.

,Into this binding material is dusted preferably such substances 4 asshort asbestos libre,

of the asphaltic mass, which prevents ad hesion of the joints whenpacked in crates, and likewise a film whhrich when a concrete mixture ispoured up against it readily'sets with they concrete, becoming a part ofthe concrete slabs 5, and by reason of its previous adhesion to theasphaltic slab becoming one uniform mass.

'I claim 1. An ex ansion joint for concrete pave-Y ments, consistin of abody containin a substantial proportlon of bituminous sustan, having aform which adapts it to serveA as a division wall in moldingconcretepavement, and having upon its surface throu h which it receives pouredconcrete, a bin 'ng material consisting of subdivided ibrous materia-ladhered to the body portion b a cement that is adhesive to it as well asto t e bituminous material of the. body, but leaving un# covered by thebituminous substances and exposed an outer surface which enters intobond*4 with the water mixed concrete when poured against it.

"2. A bituminous expansion joint havin coated upon its sides a bindingmaterial hesive to 4bituminous substance and having dusted upon saidbinding material a bonding material in subdivided form, which isadhesive both as to the binding material and water mixed concrete whenpoured against it.

3. A bituminous ex anslon joint having coated upon its sides a indingmaterial comprising sodium silicate adhesive to bitumi- 109 noussubstance and having dusted upon said binding material a bondingmaterial adhesive both as to the binding material and Water mixedconcrete when poured against it; said bonding material consisting of afibrous substance distributed upon the binding material while thesubstance is in subdivided form, thereby causing the fibers to beintimately interwoven.

4. An article of manufacture composed of a body of bituminous materialhaving a coating film on its surface which is normally nonadhesive butcapable of becoming adhesive in the presence of water, and granularmaterial partiallyembedded in the coating film to prov vide projectinguncoated areas.

5. An article of'manufacture composed of a body of bituminous materialhaving a coat- 'ing lm of sodium silicate.

6. An expansion joint composed of a body of bituminousrmaterial havingan adhesive coating on its surface, and grandular material partiallyembedded in said coating to provide a rough uncoated surface areaadapted to bond with adjacent plastic material.

7. A paving structure comprising concrete slabs and interposed expansionjoint strips, said strips being composed of a bituminous slab coatedupon its sides, with a binding material adhesive to a bituminoussubstance and having dusted upon said binding material a bondingmaterial in subdivided form, which is adhesive both as to the bindingmaterial and adjacent Water-mixed concrete.

8. A paving structure comprising concrete slabs and interposed expansionjoint strips, said strips composed of a bodyl of bituminous materialhaving an adhesive coating on its surface, and granular materialpartially em` bedded in said coatin to provide a rou h uncoated surfacearea a opted to bond IWlth adjv jacent plastic material. Signed atChicago, illinois, this 24th day vof July, A., D. 1922.

nar c. risen.'

Landrea-

